tcpdump host switchIP -v
tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes
12:19:23.385452 IP (tos 0x10, ttl  64, id 58369, offset 0, flags [DF], proto: TCP (6), length: 60) 10.0.0.70.52982 > hostname.telnet: S, cksum 0xb1ca (correct), 2519843223:2519843223(0) win 5840 <mss 1460,sackOK,timestamp 683287958 0,nop,wscale 2>
12:19:26.385278 IP (tos 0x10, ttl  64, id 58370, offset 0, flags [DF], proto: TCP (6), length: 60) 10.0.0.70.52982 > hostname.telnet: S, cksum 0xaedc (correct), 2519843223:2519843223(0) win 5840 <mss 1460,sackOK,timestamp 683288708 0,nop,wscale 2>
12:19:32.385066 IP (tos 0x10, ttl  64, id 58371, offset 0, flags [DF], proto: TCP (6), length: 60) 10.0.0.70.52982 > hostname.telnet: S, cksum 0xa900 (correct), 2519843223:2519843223(0) win 5840 <mss 1460,sackOK,timestamp 683290208 0,nop,wscale 2>
12:19:44.388644 IP (tos 0x10, ttl  64, id 58372, offset 0, flags [DF], proto: TCP (6), length: 60) 10.0.0.70.52982 > hostname.telnet: S, cksum 0x9d48 (correct), 2519843223:2519843223(0) win 5840 <mss 1460,sackOK,timestamp 683293208 0,nop,wscale 2>